Page last updated: 2024-10-24

exo-alpha-(2->6)-sialidase activity

Definition

Target type: molecularfunction

Catalysis of the hydrolysis of alpha-(2->6)-glycosidic linkages of terminal sialic residues in substrates. [EC:3.2.1.18, GOC:mengo_curators]

Exo-alpha-(1-u003e2)-mannosyltransferase (EC 2.4.1.80) is a glycosyltransferase that catalyzes the transfer of a mannose residue from a donor molecule, typically GDP-mannose, to the alpha-1 position of a terminal mannose residue on an acceptor oligosaccharide. This enzyme is involved in the biosynthesis of N-linked glycans, which are complex carbohydrate structures that are attached to proteins in the endoplasmic reticulum and Golgi apparatus. The specific function of exo-alpha-(1-u003e2)-mannosyltransferase is to add a mannose residue to the alpha-1 position of the terminal mannose residue on the Man(5)GlcNAc(2) precursor oligosaccharide, which is the initial substrate for N-glycosylation. This addition of a mannose residue is essential for the proper folding and function of many proteins. In addition to its role in N-glycosylation, exo-alpha-(1-u003e2)-mannosyltransferase has also been implicated in the biosynthesis of other complex carbohydrates, such as those found in fungal cell walls. The enzyme is a highly conserved protein, with homologues found in a wide variety of organisms, including bacteria, fungi, plants, and animals. The structure of exo-alpha-(1-u003e2)-mannosyltransferase has been determined by X-ray crystallography, revealing a complex protein with multiple domains that are involved in substrate binding and catalysis.'
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Proteins (4)

ProteinDefinitionTaxonomy
Sialidase-2A sialidase-2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9Y3R4]Homo sapiens (human)
Sialidase-3A sialidase-3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9UQ49]Homo sapiens (human)
Sialidase-1A sialidase-1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q99519]Homo sapiens (human)
Sialidase-4A sialidase-4 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q8WWR8]Homo sapiens (human)

Compounds (30)

CompoundDefinitionClassesRoles
danthronchrysazin : A dihydroxyanthraquinone that is anthracene-9,10-dione substituted by hydroxy groups at positions 1 and 8.

danthron: structure
dihydroxyanthraquinoneapoptosis inducer;
plant metabolite
emodinemodin : A trihydroxyanthraquinone that is 9,10-anthraquinone which is substituted by hydroxy groups at positions 1, 3, and 8 and by a methyl group at position 6. It is present in the roots and barks of numerous plants (particularly rhubarb and buckthorn), moulds, and lichens. It is an active ingredient of various Chinese herbs.

Emodin: Purgative anthraquinone found in several plants, especially RHAMNUS PURSHIANA. It was formerly used as a laxative, but is now used mainly as a tool in toxicity studies.
trihydroxyanthraquinoneantineoplastic agent;
laxative;
plant metabolite;
tyrosine kinase inhibitor
carzenidesulfonamide
rheindihydroxyanthraquinone
zanamivirZanamivir: A guanido-neuraminic acid that is used to inhibit NEURAMINIDASE.guanidinesantiviral agent;
EC 3.2.1.18 (exo-alpha-sialidase) inhibitor
oseltamiviroseltamivir : A cyclohexenecarboxylate ester that is the ethyl ester of oseltamivir acid. An antiviral prodrug (it is hydrolysed to the active free carboxylic acid in the liver), it is used to slow the spread of influenza.

Oseltamivir: An acetamido cyclohexene that is a structural homolog of SIALIC ACID and inhibits NEURAMINIDASE.
acetamides;
amino acid ester;
cyclohexenecarboxylate ester;
primary amino compound
antiviral drug;
EC 3.2.1.18 (exo-alpha-sialidase) inhibitor;
environmental contaminant;
prodrug;
xenobiotic
2-deoxy-2,3-dehydro-n-acetylneuraminic acid2-deoxy-2,3-dehydro-N-acetylneuraminic acid : N-Acetylneuraminic acid reduced across the 2,3-bond with loss of the hydroxy group at C-2; it is a minor component of body fluids although abundant in sialuria.

2-deoxy-2,3-dehydro-N-acetylneuraminic acid: also known as NeuAc2en, but this is also synonym for another compound
N-acetylneuraminic acids
9,10-anthraquinone 2-carboxylic acid9,10-anthraquinone 2-carboxylic acid: structure in first source
5-hydroxyflavoneflavones
(-)-catechin(-)-catechin : The (-)-enantiomer of catechin.catechinmetabolite
sakuranetinsakuranetin : A flavonoid phytoalexin that is (S)-naringenin in which the hydroxy group at position 7 is replaced by a methoxy group.

sakuranetin: major rice phytoalexin; RN given for ((S)-(-))-isomer; structure in first source
(2S)-flavan-4-one;
4'-hydroxyflavanones;
dihydroxyflavanone;
flavonoid phytoalexin;
monomethoxyflavanone
antimycobacterial drug;
plant metabolite
bcx 18123-hydroxy monocarboxylic acid;
acetamides;
cyclopentanols;
guanidines
antiviral drug;
EC 3.2.1.18 (exo-alpha-sialidase) inhibitor
n-acetylneuraminic acidN-acetylneuraminic acid : An N-acylneuraminic acid where the N-acyl group is specified as acetyl.

N-Acetylneuraminic Acid: An N-acyl derivative of neuraminic acid. N-acetylneuraminic acid occurs in many polysaccharides, glycoproteins, and glycolipids in animals and bacteria. (From Dorland, 28th ed, p1518)
N-acetylneuraminic acidsantioxidant;
bacterial metabolite;
EC 3.2.1.18 (exo-alpha-sialidase) inhibitor;
human metabolite;
mouse metabolite
n-acetylneuraminic acidN-acetyl-beta-neuraminic acid : N-Acetylneuraminic acid with beta configuration at the anomeric centre.N-acetylneuraminic acidepitope
4-amino-2-deoxy-2,3-didehydro-n-acetylneuraminic acid
bana 113
quercetin7-hydroxyflavonol;
pentahydroxyflavone
antibacterial agent;
antineoplastic agent;
antioxidant;
Aurora kinase inhibitor;
chelator;
EC 1.10.99.2 [ribosyldihydronicotinamide dehydrogenase (quinone)] inhibitor;
geroprotector;
phytoestrogen;
plant metabolite;
protein kinase inhibitor;
radical scavenger
acacetin5,7-dihydroxy-4'-methoxyflavone : A monomethoxyflavone that is the 4'-methyl ether derivative of apigenin.dihydroxyflavone;
monomethoxyflavone
anticonvulsant;
plant metabolite
apigeninChamomile: Common name for several daisy-like plants (MATRICARIA; TRIPLEUROSPERMUM; ANTHEMIS; CHAMAEMELUM) native to Europe and Western Asia, now naturalized in the United States and Australia.trihydroxyflavoneantineoplastic agent;
metabolite
luteolin3'-hydroxyflavonoid;
tetrahydroxyflavone
angiogenesis inhibitor;
anti-inflammatory agent;
antineoplastic agent;
apoptosis inducer;
c-Jun N-terminal kinase inhibitor;
EC 2.3.1.85 (fatty acid synthase) inhibitor;
immunomodulator;
nephroprotective agent;
plant metabolite;
radical scavenger;
vascular endothelial growth factor receptor antagonist
kaempferol7-hydroxyflavonol;
flavonols;
tetrahydroxyflavone
antibacterial agent;
geroprotector;
human blood serum metabolite;
human urinary metabolite;
human xenobiotic metabolite;
plant metabolite
genistein7-hydroxyisoflavonesantineoplastic agent;
EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor;
geroprotector;
human urinary metabolite;
phytoestrogen;
plant metabolite;
tyrosine kinase inhibitor
baicaleintrihydroxyflavoneangiogenesis inhibitor;
anti-inflammatory agent;
antibacterial agent;
anticoronaviral agent;
antifungal agent;
antineoplastic agent;
antioxidant;
apoptosis inducer;
EC 1.13.11.31 (arachidonate 12-lipoxygenase) inhibitor;
EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor;
EC 3.4.21.26 (prolyl oligopeptidase) inhibitor;
EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor;
EC 4.1.1.17 (ornithine decarboxylase) inhibitor;
ferroptosis inhibitor;
geroprotector;
hormone antagonist;
plant metabolite;
prostaglandin antagonist;
radical scavenger
chrysinchrysin : A dihydroxyflavone in which the two hydroxy groups are located at positions 5 and 7.7-hydroxyflavonol;
dihydroxyflavone
anti-inflammatory agent;
antineoplastic agent;
antioxidant;
EC 2.7.11.18 (myosin-light-chain kinase) inhibitor;
hepatoprotective agent;
plant metabolite
genkwaningenkwanin : A monomethoxyflavone that is apigenin in which the hydroxy group at position 7 is methylated.

genkwanin: structure
dihydroxyflavone;
monomethoxyflavone
metabolite
myricetin7-hydroxyflavonol;
hexahydroxyflavone
antineoplastic agent;
antioxidant;
cyclooxygenase 1 inhibitor;
food component;
geroprotector;
hypoglycemic agent;
plant metabolite
scutellareinscutellarein : Flavone substituted with hydroxy groups at C-4', -5, -6 and -7.

scutellarein: aglycone of scutellarin from Scutellaria baicalensis; carthamidin is 2S isomer of scutellarein; do not confuse with isoscutellarein and/or isocarthamidin which are respective regioisomers, or with the scutelarin protein
tetrahydroxyflavonemetabolite
tricetintricetin : Flavone hydroxylated at positions 3', 4', 5, 5' and 7.pentahydroxyflavoneantineoplastic agent;
metabolite
4',7-dihydroxyflavone4',7-dihydroxyflavone : A dihydroxyflavone in which the two hydroxy substituents are located at positions 4' and 7.

4',7-dihydroxyflavone: inducer of nod gene
dihydroxyflavonemetabolite
5,7,2'-trihydroxyflavone5,7,2'-trihydroxyflavone: has inhibitory effects on the EBV-EA activation & on mouse skin tumor promotion in an in vivo two-stage carcinogenesis test; from Scutellaria baicalensis; structure given in first sourceflavones